How to set initial values for NSUserDefault Keys?

You should use the registerDefaults method of NSUserDefaults. Prepare a plist file in your bundle that contains the default preferences and then use that plist to register the defaults.

NSString *defaultPrefsFile = [[NSBundle mainBundle] pathForResource:@"defaultPrefs" ofType:@"plist"];NSDictionary *defaultPreferences = [NSDictionary dictionaryWithContentsOfFile:defaultPrefsFile];[[NSUserDefaults standardUserDefaults] registerDefaults:defaultPreferences];

You have to execute this code on every launch of your app. It will add these values to a separate domain in the user defaults hierarchy. Whenever your app's user defaults don't provide a value for a certain key, NSUserDefaults will fall back to this domain and retrieve the value from there.

If you have many default values, let use ola's answer, otherwise this is good for a few params

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];if (![defaults boolForKey:USERDEFAULT_IS_INITIALIZED]) {     [defaults setBool:YES forKey:USERDEFAULT_IS_INITIALIZED];    // Set initial values     ...    [defaults synchronize];}

if ([[[[NSUserDefaults standardUserDefaults] dictionaryRepresentation] allKeys] containsObject:@"initialValuesHaveBeenWritten"]){    [[NSUserDefaults standardUserDefaults] setValue:obj1 forKey:key1];    [[NSUserDefaults standardUserDefaults] setValue:obj2 forKey:key2];    [[NSUserDefaults standardUserDefaults] setValue:obj1 forKey:@"initialValuesHaveBeenWritten"];    [[NSUserDefaults standardUserDefaults] synchronize];}

NB: Not tested, done from memory